Secure Policy Based Data Sharing for Dynamic Groups in the Cloud

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Provided by: International Journal of Advanced Research in Computer Engineering & Technology
Topic: Security
Format: PDF
Major problem in public clouds is how to share documents based on fine-grained attribute based access control policies, sharing data in a dynamic groups while preserving data and identity privacy from an un trusted cloud is still a challenging issue, due to the frequent change of the membership., encrypting documents with different keys using a public key cryptosystem such as Attribute Based Encryption (ABE), and/or Proxy Re-Encryption (PRE) approach has some weaknesses: it cannot efficiently handle adding/revoking users or identity attributes, and policy changes; it requires to keep multiple encrypted copies of the same documents; it incurs high computational costs.
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